<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
    <style>
      header,
      nav,
      section {
        display: block;
        height: 120px;
        background-color: red;
        margin: 10px;
      }
    </style>
  </head>

  <body>
    <header>header</header>
    <header>header</header>
    <nav>nav</nav>
    <section></section>
  </body>
</html>
